Re: [PATCH 5/8] mm: vmscan: Do not writeback filesystem pages in kswapd

To:	Mel Gorman <mgorman@xxxxxxx>
Subject:	Re: [PATCH 5/8] mm: vmscan: Do not writeback filesystem pages in kswapd except in high priority
From:	Minchan Kim <minchan.kim@xxxxxxxxx>
Date:	Mon, 1 Aug 2011 00:11:40 +0900
Cc:	Linux-MM <linux-mm@xxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, XFS <xfs@xxxxxxxxxxx>, Dave Chinner <david@xxxxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, Johannes Weiner <jweiner@xxxxxxxxxx>, Wu Fengguang <fengguang.wu@xxxxxxxxx>, Jan Kara <jack@xxxxxxx>, Rik van Riel <riel@xxxxxxxxxx>
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On Thu, Jul 21, 2011 at 05:28:47PM +0100, Mel Gorman wrote:
> It is preferable that no dirty pages are dispatched for cleaning from
> the page reclaim path. At normal priorities, this patch prevents kswapd
> writing pages.
> 
> However, page reclaim does have a requirement that pages be freed
> in a particular zone. If it is failing to make sufficient progress
> (reclaiming < SWAP_CLUSTER_MAX at any priority priority), the priority
> is raised to scan more pages. A priority of DEF_PRIORITY - 3 is
> considered to tbe the point where kswapd is getting into trouble
> reclaiming pages. If this priority is reached, kswapd will dispatch
> pages for writing.
> 
> Signed-off-by: Mel Gorman <mgorman@xxxxxxx>
Reviewed-by: Minchan Kim <minchan.kim@xxxxxxxxx>

-- 
Kind regards,
Minchan Kim

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[RFC PATCH 0/8] Reduce filesystem writeback from page reclaim v2, Mel Gorman [PATCH 1/8] mm: vmscan: Do not writeback filesystem pages in direct reclaim, Mel Gorman Re: [PATCH 1/8] mm: vmscan: Do not writeback filesystem pages in direct reclaim, Minchan Kim [PATCH 2/8] xfs: Warn if direct reclaim tries to writeback pages, Mel Gorman Re: [PATCH 2/8] xfs: Warn if direct reclaim tries to writeback pages, Christoph Hellwig Re: [PATCH 2/8] xfs: Warn if direct reclaim tries to writeback pages, Mel Gorman [PATCH 3/8] ext4: Warn if direct reclaim tries to writeback pages, Mel Gorman [PATCH 4/8] btrfs: Warn if direct reclaim tries to writeback pages, Mel Gorman [PATCH 5/8] mm: vmscan: Do not writeback filesystem pages in kswapd except in high priority, Mel Gorman Re: [PATCH 5/8] mm: vmscan: Do not writeback filesystem pages in kswapd except in high priority, Minchan Kim <= [PATCH 6/8] mm: vmscan: Throttle reclaim if encountering too many dirty pages under writeback, Mel Gorman Re: [PATCH 6/8] mm: vmscan: Throttle reclaim if encountering too many dirty pages under writeback, Minchan Kim [PATCH 7/8] mm: vmscan: Immediately reclaim end-of-LRU dirty pages when writeback completes, Mel Gorman Re: [PATCH 7/8] mm: vmscan: Immediately reclaim end-of-LRU dirty pages when writeback completes, Peter Zijlstra Re: [PATCH 7/8] mm: vmscan: Immediately reclaim end-of-LRU dirty pages when writeback completes, Mel Gorman Re: [PATCH 7/8] mm: vmscan: Immediately reclaim end-of-LRU dirty pages when writeback completes, Minchan Kim [PATCH 8/8] mm: vmscan: Do not writeback filesystem pages from kswapd, Mel Gorman Re: [PATCH 8/8] mm: vmscan: Do not writeback filesystem pages from kswapd, Peter Zijlstra Re: [PATCH 8/8] mm: vmscan: Do not writeback filesystem pages from kswapd, Mel Gorman Re: [RFC PATCH 0/8] Reduce filesystem writeback from page reclaim v2, Dave Chinner

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